Personalized I'm One Years Old with Dog and Mouse Men's Tank Top. Celebrate your birthday with Dog and Mouse, the unlikely best friends from the children's book "Dog and Mouse" by Michelle Nelson-Schmidt. I'm One Year Old with Dog and Mouse Men's Tank Top - White, perfect for young readers, helpers, and great friends on their birthday. Pre-shrunk 100% cotton 6.1 ounce Quarter turned Adult: S, M, L, XL, 2XL